Scale.



F. c. OSB'ORN.

SCALE.

Ir^\PPLlC/\`:'|O4 FILED FEB.|7. 1913. j; Q89 Patented Dec. 3l, i918.

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TTUR EY yF. C. OSBORN.

SCALE.

APPLICATION HLED FEB. 17.1913.

Patented Dec. 31, 1918.

3 SHEETS-SHEET 3.

2 A TTUR/VEY FRANCIS C. OSBORN, 0F DETROIT, MICHIGAN.

SCALE.

Specication of Letters Patent.

Patented Dec. 31, 1918.

Application led February 17, 1913. Serial No. 748.813.

To all whom t may4 concern.'A

Be it known that I, FRANCIS C. OsBoRN,

citizen of the United States, and a resident of Detroit, in the county of Wayne and State of Michigan, have invented a new and useful Scale, of which the following is a specication.

This invention relates to the construction of weighing scales in which the load is resisted by a spring and the weight of the load is indicated by a pointer moving over an'- inclined circular dial, and the object of this invention is to -provide a novel connection between the lever mechanism of the scale and the indicating mechanism, which shall be simple, delicate, and adjustable and which can be constructed at low cost. f

This invention consists, in combination wilth a case, a weight receiver having a downwardly extending stem, a lever to which Jche stem connects, and a spring between the case and stem, of a rack-plate secured to the end of the lever and bent to an arc having the pivot of the lever for its center and having teeth along one edge, a shaft having secured `to it a gear meshing vwith the rack-plate, of a dial at right angles to said shaft, and an indicating hand secured in a novel manner to said shaft. It furtherconsists in a novel device for suspending thespring from the top of the case and a novel device for connecting the spring to the load receiver.

In the accompanying drawings, Figure 1 is a vertical, central section of this improved scale. Fig. 2 is a section on the line 2 2 of Fig. 1. Fig. 3 is a section on the line 3-3 of Fig. l. Fig. 4 vis a section on the line 4-.4 of Fig. 3. Fig. 5 is an eleva-1,

tion of the curved rack-plate. Fig. 6 is ,a section on the line 6--6 of Fig. 7. Fig.I 7 isan enlarged detail of a portion of Fig. 1. Fig. 8 is an elevation of the dial. Fig. 9

is a section on the line 9-9 of Fig. 8. Figs.

10 and 11 are views of the spring-supporting crab.

Similar reference characters refer to like parts lthroughout, the several views.

-The base and case of this scale are formed of sheet metal, the base 1 having slots through which extend the tongues 2 l0n the sides 3 and 4, back 5 and front cross-bar 6.c The edges of the sides preferably lap over the back. A strong upright frame at the back of the case has side bars 7, lower cross bar 8 withelugs 9, and top bar 10. The

guide link 1l is pivoted on the rod 13 carried by this frame, and the lever 14 is mounted on the rod 15 carried by the lugs 9. Screws 16 hold the frame in position.v

'Within the case is an arched-bar 17, held linposition by screws 18, from which the spring-19 is suspended. As shown in Figs. 6 and 7, a screw-threaded sleevef21 is mounted v1n the nut 20 and has a groove 22 into which the pin 23 carried by the arched-bar 17 extends. The upper end of this sleeve forms a seat for 'the collar 24 on the upper end of the rod 25. The adjacent faces of the collar 24 and the sleeve 2'1 are preferably spherical so that the rod 25 may swing with the spring.

' The pla|te 27 is the load receiver and connects t0 the upper end of the Stem 28, Whose lower end connectsto the lever 14 by means of a pivot 29, and to Whose intermediate nortion the link4 11 connects by the rod 30.

The stein 28 has an arm 32 and a screw 33 extends 'through this arm and is threaded into the stemay .The space between the screw 3'3 and arm 32 is less than the diameter 4of the spring so it cannot` escape from the groove 34. groove 34 in this screw receives the lower bent end of the spring 19 so that the point of attachment of the spring to the stem canf/beaccurately predetermined.

The upperendofthe spring is engaged by the crab 35fhaving fins" 36 that/extend between ithe wraps of the spring and which may be turned relative to the spring to adjust its length. AThis crab is mounted on the lower end ofthe rod 25.

A front plate` 37, preferably circular, is

secured to the top 38, the sides 3 and 4 and' the front cross-bar 6 by means of tongues 39 passing through slots in 'this plate. The central portion 40 of this plate is pressed outward, as shown in Fig. 1, and the dial 41 is secured to it by means of screws 43. T he holes in the dial and the heads of screws 43 are made large to permit the dial to be moved in anydirection relative to the hand 44 (Fig. 9), in order -to more readily seal the scale, that is, to adjust the graduations for variations in the action of the spring. This hand is preferably provided with a hexagonal hole into which a round portion 45 of the small sleeve 46 extends.` The outer end of the bore of :the sleeve is internally toothed to match the teeth on the outer end of the pintle 47, as shown in Fig. 4. The reason for this polygonal hole is that the end ll5 ofthe sleeve can be easily riveted down to hold the hand in position, after dial is made by the nut 20.

A ring 50, preferably pressed or spun out ot sheet metal, rests against the dial 4:1 and supports the circular plate 52 of glass, which in turn is held in position by a second ring 53 of metal provided with tongues 54C that extend through the plate 37 and are then bent over. On the pintle 4:7 is the gear 56, and the inner end of the pintle is guided in a bracket 57, secured to the depressed portion 40 of the late 37by screws 58, as shown in F ig. 8. n the end of the lever 14: is the screw 59 on -which is mounted the rackplate 60, which is bent to a circular curve Whose center is the pin l5. rIhe rack-plate can swing on this screw and is held against the I gear 5G by means of the, spring 62 carried by the screw 63, as shown in Figs. I and 5. 'Ihis spring, by pressing down on the rackplate, prevents lost motion between the screw 59 and the rack-plate.

The stem 28 will always move parallel to its original position as the link 11 is of the same length as the load arm of the lever 14. The engagement of the rack-plate 60 with the gear will be constant because of the tension of the spring 62, but to make certain that. the rack-plate shall not disengage because of any jars or jolts to which the scale may be subjected, the screw 64 may be mounted on the plate 37 just in the rear of the rack-plate, as shown in Fig. 2. It willbe understood that the various adjusting means comprising the movement of the dial, the movement of the lower end of the spring and of the upper end of the suspending rod coperate to produce a perfectly act-ing scale. v

I claim.

l. In a weighing scale, the combination of a case, a lever, a weight receiver and a spring connected to said weight receiver, a front plate havin an outward extending central portion, a dial adjustably secured thereto,

.a pintle extending through said dial and having a hand on its outer end and a gear on its inner end, and a rack-plate connected to said lever and engaging the gear so that the hand may be turned at the movement of the load receiver.

2. In a weighing scale, the combination of a case, a lever, a weight receiver and a spring connected to said weight receiver, a' front plate, a dial adjustable eccentrically in all directions in its lane secured thereto a pintle extending tiirough said dial and having a hand on its outer end anda gear on its inner end, and a rack-plate connected Lacasse to said lever and engaging the gear so that the hand may be turned at the movement of the load receiver.

3. In a weighing scale, the combination of l a case, a weight receiver and a spring connected to said weight receiver, a front plate, a dial having a plurality of openings, screws of less diameter than said openings extending therethrough to adjustably secure the dial on the front plate, Ya pintle extending through said dial and having a hand on its outer end and a gear on its inner end, and

a rack-plate engaging the gear so that the adjustably support said sleeve, and a weight l indicator connected to said weight receiver.

5. In a weighing scale, the combination of a case, a weight receiver, a spring connecting at its lower end to the weight receiver, means to change the relative positions of the lower end of the sprin a supporting ro loosely connected at its lower end to said spring and extending upwardly out of said case, a collar secured to .the upper end of the rod, a threaded sleeve loosely surrounding the rod and' supporting the collar, rod and spring, means to revent the sleeve from turning, a nut on sai sleeve and mounted on the case to adjustably support the sleeve, and a weight indicator connected to said load receiver.

6. In a weighing scale, the combination of a case, a weight receiver comprising a plate and a vertical stem, an adjustable screw mounted in said stem and having a groove, a spring suspended from the top of the case and having a hook at its lower end engaging in said dgroove and adapted to be'v laterally adjuste by said screw, and a weight indicator connected to said stem.

7. In a weight indicator, the combination of a case, a weightvreceiver mounted therein, a spring suspended from the top of the case, means connecting the lower end or the spring to the load receiver and adjustable to move said lower end toward and from the weight receiver, and a weight indicator connected to said load receiver. v

8. In a wei hing scale, the combination of a case, a loa receiver, a spring suspended from said case, adjustable means for connecting the lower end of the spring to said load receiver and varying the relative positions of the lower end of the spring and the load receiver, a weight indicator comprising and the weight receiver,-

of a case, a load receiver, a spring connected .adjustable means for connecting the lower end of the spring to said load receiver and for varying the relative lpositions of theA lower end of the spring and the loadreceiver, a weight indicator comprising a dial and a hand, means connecting the hand and load receiver, means adjustably supporting the dial, and vertically adjustable means for supporting the spring.\ l l 10. In a weighing scale, the combination thereto to resist the load, a lever connected to the load receiver, a curved rack-plate eX- tendingupward from the end of the lever, a pivot carrled by the lever on which the rackplate is mounted, a pintle having an indicator and a gear connected to it, `means to support the pintle, said rack-plate havin a lateral` projection at its lower end, an a spring mounted on the lever and pressing down on the rojection on the rack-plate to hold the racE-plate against said gear and to. hold the rack downward so as to act in conjunction with the force of gravity tol prevent llost motion between the rack and lever. l l

11. In a weighing scale, the combination of a case, a lever, a load receiver, a spring to resist the load, a dial mounted on the case, a pintle extending through the dial and having its outer end longitudinally grooved to form regular teeth, means connecting the pintle and the lever, a hand havin a polygonal hole, and a sleeve having a cy indrical end extending into the polygonal hole in the hand and having its outer end formed with interior teeth to fit the toothed end of the lpintle so that the hand can bel adjustably mounted thereon.

12. In a weighing scale, the combination of a case,- a iever, a Aweight receiver and a spring connected to the weight receiverand case, a front plate, a dial secured to the plate, said dial being adjustable in all directions in its plane, a pintle revolubly mounted in the front plate, a hand thereon movable over the dial and operative connections between the pintle and lever.

13. In la weighing scale, the combination of a case, a load receiver, a spring connected to the load receiver to resist the load, means for varying the effective working length of the spring, means for raising and lowering the spring and means for laterally varying'the relation of the spring and the load receiver at their point of connection.

' 14.' In a spring acting wei hing scale com vthe length of the spring, and means for adjustin the dial in any direction in its plane.

15. n a weighing scale, the combination of a case, a load receiver, a spring to resist the load, a dial mounted in the case, a pintle extending through the dial and having its outer cylindrical end longitudinally grooved to form regular teeth, means connecting the pintle and the load receiver whereby the pintle is rotated by the load, a hand having .a hole formed with interior teeth to fit the toothed end of the pintle so that the hand can be adjustably mounted thereon. l

In testimony whereof I have signed this specification in the presencelof two subscribing witnesses. y 

